Christian graf-link



(No Model.)

G. GRAF-LINK. I CASING 0R TROUGH FOB. GRINDSTONES.,

No. 498,647. Y Patented May 30, 1893.

iiiiliiiiliiiiiiiiiil CHRISTIAN GRAF-LINK, OF ROMANSHORN, SWITZERLAND.

CASING OR TROUGH FOR GRINDSTONES.

SPECIFICATION forming part of Letters Patent No. 498,647, dated May 30,1893.

'Annlioation filed October 20, 1892. Serial 110.4%,481. (No model.)Patented in Switzerland March 24, 1892, No. 4,766-

To all w/wm it may conceive:

Be it known that I, CHRISTIAN GRAFLINK, a citizen of Switzerland,residing at Romanshorn, Switzerland, have invented certain new anduseful Improvements in Casings or Troughs for Grindstones, (for which Ihave obtained Letters Patent of Switzerland, No. 4,766,dated March 24,1892;) and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in casingsor troughs for grindstones, and especially to troughs applicable to thatclass .of grindstones used by jewelers and opticians, and in which thestone or wheel'is partially submerged in the water. 7 The main object ofthe invention is the provision of a trough of such construction thatwhen not in use the stone can be supported out of contact with the waterin said trough.

The great disadvantage arising from the employment of grindstones now inuse in the shops of mechanics, watch-makers, jewelers, Opticians, &c.,is that the stones soon become uneven, by reason of holes, and cannot beused until they are turned anew. This operation, however, is toilsome,and has to be frequently repeated, which causes the stone to wear out ina short time. This uneven wearing of a stone is due to the fact that aportion of its surface is constantly in the water, and, as it never hasa chance to dry thoroughly, it soon softens. Consequently, when thestone is in use, this part constantly in the water wears away fasterthan those portions of the stone which are exposed to the air and whichremain dry when not in use. I have also found that those portions of thestone which are thus submerged in the water in the trough graduallydisintegrate and dissolve, and thus render the stone unfit for longservice.

Another disadvantage arising from the use of the present grindstones isthat when an eye-glass or other small article drops into the trough thewhole grindstone must be taken apart before the article can be removed.

The present invention is intended to overcome these disadvantages, andis illustrated in the accompanying drawings,in which- Figure 1 is aperspective view of a casing or trough constructed in accordance with myinvention, and with the stone in position for use; and Fig. 2 is asimilar view showing the stone supported out of contact with the Waterin the trough.

. Like letters of referenceindicatelike parts in both views. A

A is the trough for the stone, and may be provided with a flat base, asshown, or mounted upon a suitable support. This trough is preferablymade higher at the rear than in front, so that the top edges thereofslope slightly downward, as shown. To the back or rear edge of thetrough is secured the knuckle a of a hinge. The frame B carries theother knuckle b of said hinge; and the trough and the frame are securedtogether by the pintlecl passed through the registering openings inthetwo knuckles. This. frame is provided at the centers of its side edgeswith the lower semi-bearings for the reception of the shaft 6 carryingthe grinding stone or wheelF. A casing or hood 0 is mounted upon theframe B to cover the rear upper portion of the stone and to preventescape of the water thrown from the face thereof. A crank G and handleG'are also provided for the purpose of turning the stone. The uppersemi-bearings for the shaft are formed in the extensions or tongues g ofthe hood C. These tongues are cast integral with the hood and areadapted to engage and co-operate with undercut recesses, formed in theframe B by the overhangs g, to lock the hood to the frame.

As shown in the drawings it will be seen that the frame B is practicallya continuation of the trough A, and that the meeting-edges of the twoparts form a water-tight ,joint. The lower front edge of the .frame B isalso provided with catches b, for the purpose of securing the frame'andthe trough still more firmly together. A handle 19 is also formed uponthe upper front edge of the frame for the purpose of raising the sameout of engagement with the trough, and thereby preventing contact of thestone with the water in the trough when the stone is not in use.

The operation of my inventionwill be readily understood from the abovedescription. When in use the grindstone is in the position shown in Fig.1, with'a portion of the stone means of the handle 19 until the stone Fisout of contact with the water, and the stone is then held in itsraised position by means of a stave h laid across the top of the trough,as shown; or it may be held in any other desired manner-as, forinstance, by elbowjoint connections between the trough and the frame.

In a grindstone constructed in accordance with my invention the stonecan be kept out of contact with the water at all times when not in use.By this means I prevent softening-and consequently uneven wearing ordisintegration-of the portion of the stone that ordinarily is in contactwith the water when not in use. The advantage of this will be apparent,especially when it is considered that'the water contained in the troughusually holds in solution acid impuritiesderived from articles ground bythe stonesu fficient to disintegrate mineral substances eX- posed totheir action. Besides, when a, lens or other small article that is beingground drops into the trough it can be removed readilywithout pouringout the water in the trough and turning the grindstone upside down bysimply raising the frame from the trough.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A casing ortrough foragrindstone,comprising a trough proper havingasuitable base or support, and a frame normally resting upon said troughand hinged thereto at one end and adapted to support a grinding stone orwheel, substantially as described.

2. A casing or trough foragrindstone, comprising a trough proper havingasuitable base or support; a frame normally resting upon said trough andhinged thereto at one end and adapted to support a grinding stone orwheel; and a hood mounted upon said frame and adapted to be raisedtherewith, substantially as described. 7

3. A casing or trough for a grindstone, comprising a trough properhaving a suitable base or support; a frame mounted upon said trough andhinged thereto and having lower semibearings adapted to receive theshaft of the grinding stone or wheel; and a hood mounted upon said frameand having corresponding upper semi bearings, substantially asdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

CHRISTIAN GRAF-LINK. Witnesses:

'l. SOHWEIZER, T. BANNSAM.

